Adapter element for a paper roll and relative dispenser with rotatable axis equipped with this adapter element

ABSTRACT

An adapter element configured for insertion inside the core of a paper roll to be applied to the support shaft of a dispenser includes an external annular wall adapted for insertion into the core of the paper roll with a predetermined degree of mechanical interference; an axial channel delimited by an annular wall arranged internally to the external annular wall; and first engaging elements configured for releasable engagement to second engaging elements belonging to the support shaft of the dispenser so that, in use, a portion of the end of the support shaft is insertable into the axial channel of the adapter element. A dispenser is also disclosed having the support shaft adaptable for engagement with the adapter element.

FIELD OF THE INVENTION

The present invention concerns the technical field of dispenser devicesfor paper rolls.

In particular, the invention concerns a particular type of adapterapplicable to the cardboard core of the roll which facilitates theapplication of a roll on a specific dispenser, thus ensuring a betterfunctionality thereof.

BRIEF OUTLINE OF THE PRIOR ART

Dispensers for paper rolls, for example toilet paper or paper rolls forindustrial use, have long been known.

For example, a particular type of dispenser is described in the USpublication U.S. Pat. No. 5,636,812.

This publication describes a dispenser formed by a case inside which arotatable element is rotatably mounted in idle manner around a hingingaxis 16 thereof. This rotatable element has three arms 14 which extendradially from the hinging point 16 and from each end of which a furthershaft 18 protrudes orthogonally to the surface thereof. Then each rollis applied to a shaft 18 taking care to insert the cardboard core of theroll on the said shaft. In this way, the roll can be readily unwoundsince the roll, during the unwinding of the paper, rolls on the shaft 18on which it is arranged.

In this particular solution, the rotatable element which includes theaforementioned three shafts has a shape such that it rotates under theaction of the force of gravity when the roll in use is fully unwound.The roll in use is the one in the lowest position but when it is fullyconsumed the weight of the roll placed on the shaft that is in a raisedposition is such as to rotate the element, carrying out an automatictransfer of position. In this way, automatically and with aconstructively simple solution, the shaft containing the singlecardboard core of the roll rotates in a hidden position within the casewhile the new roll is placed in the lowest position previously occupiedby the roll which has been consumed and at the opening from which it canbe normally unwound.

Having said that, a technical disadvantage concerning these types ofsolutions is that the core of the paper roll to be applied in use doesnot always have a precise cylindrical shape for a series of reasons.

For example, some rolls may have a deformed core due to a “core crash”effect when cutting the paper log from which they are obtained.

There are also paper rolls that at the end of the production process arecompressed so as to reduce the volume and, therefore, the transportationcosts. The compression obviously causes a strong crushing of the core.

Therefore, in all the above-described events, the core, usually made ofcardboard around which the paper roll is wound, is deformed or evendamaged. This causes a difficult or even impossible installation of theroll on the support shaft from which the paper is unwound in use.Moreover, consequently, the rotation of the roll around the supportshaft is imperfect, if not even prevented.

This technical disadvantage is particularly inconvenient for the user inthe event when the roll is installed on a support shaft of a paperdispenser of the type commonly installed in toilets of businessactivities such as hotels, restaurants, shopping centers, etc. In fact,in this case, the dispenser provides a container body comprising a fixedpart, constrained to a wall of the room, and a removable partconstrained to the fixed part through a lock to prevent fraudulentopenings of the dispenser. Once the authorized operator has loaded thedispenser with the roll, the roll is no longer accessible as it isclosed within the dispenser. Consequently, in the event of poor rollingof the roll for the reasons explained above, the user is not able toreach the paper roll and therefore is not able to unwound the strip.

Furthermore, if rolls of different types are used, the size of the coremay be different, therefore having an excessive diameter with respect tothe axis on which it must be arranged. This would lead to an excessiveclearance of the roll with respect to the axis with a possibility ofmalfunction.

Finally, it is important to ensure that the roll and the paper wrappedon it are kept in the correct position.

Adapter systems such as those described for example in U.S. Pat. No.5,597,135 are known in which the adapter is inserted with a certaindegree of interference within the core of the roll.

However, the above-mentioned adapter can be connected to a dispenserrotation system only in one of the ends thereof that corresponds to thepart of the adapter that abuts the roll, therefore an external part tothe roll. This causes problems of stability of the roll which is notwell secured to its rotation axis and can slide off.

SUMMARY OF THE INVENTION

Therefore, the aim of the present invention is to provide an innovativeadapter element for a dispenser for paper rolls and a dispenser whichincludes said adapter, which resolves at least in part said technicaldisadvantages.

In particular, the aim of the present invention is to provide an adapterwhich easily enables to apply the roll to the dispenser shaft thereof,even in the event of roll with deformed core, thus ensuring a uniformrolling and with different sizes of core.

The aim of the present invention is also to provide an adapter elementwhich enables to maintain the roll in the correct position, fixing itfirmly to the dispenser.

The aim of the present invention is also to provide a dispenser equippedwith this adapter element.

These and other aims are therefore achieved with the present adapterelement (11), according to claim 1.

This adapter element (11) is configured for being insertable inside thecore (110) of a paper roll (100) to be applied to a support shaft (7, 8,9) of a dispenser (10) for paper rolls.

According to the invention, the adapter element (11) comprises anexternal annular wall (12) suitable for being inserted into the core(110) of the paper roll with a predetermined degree of mechanicalinterference.

Moreover, the adapter element (11) comprises an axial channel (14 c)delimited by an annular wall (14, 14′) arranged internally to theexternal annular wall (12) and comprising first engaging elements (15 a)suitable for being engaged in releasable manner to second engagingelements (15 b) belonging to said support shaft (7, 8, 9) of thedispenser to which said adapter element (11) is intended so that, inuse, a portion of the end (7 s) of said support shaft (7, 8, 9) isinsertable in said axial channel (14 c) of the adapter element (11),engaging to it.

In this way, an axial engagement of the adapter element with the supportelement occurs, that is an engagement which prevents one element fromsliding off with respect to the other.

In this way, all the described technical disadvantages are solved.

In particular, by means of the adapter element, the cardboard core ofthe roll returns and maintains its original shape, thus ensuring asuitable rolling of the core on the support shaft.

Moreover, the adapter enables a fast application of the core to thesupport shaft, avoiding at the same time the fortuitous sliding offthereof.

Advantageously, said first engaging elements (15 a) can be configured soas to be engaged to said second engaging element (15 b) so that saidactuator element (11) is rotatable in idle manner around said supportshaft (7, 8, 9) to which is engaged in use.

Advantageously, the adapter element (11) can have an excess (13′) whichextends radially from the external annular surface (12) so as to form anannular abutment.

Advantageously, the external annular surface can be fitted with one ormore wedges (16).

Advantageously, the external annular surface (12) can be configured soas to have a predetermined degree of flexibility.

Advantageously, said external annular surface (12) can be of genericallycylindrical shape and it is configured for forming a pilot path at theend thereof.

Advantageously, said first engaging elements (15 a) are in the form of atooth (15 a) and said annular wall (14, 14′) on which said tooth isarranged is configured so as to be elastically deformable so that, inuse, when the shaft (7, 8, 9) is inserted into the channel delimited bysaid annular wall (14, 14′), it is elastically deformed enabling saidtooth to pass over a second tooth (15 b) belonging to the end of theshaft by locking itself against it once passed over it.

Advantageously, said annular wall (14, 14′) can be generallyfunnel-shaped.

It is also described here an assembly for constraining a paper rollprovided with core to a dispenser, said assembly comprising:

-   -   An adapter element (11) and a support shaft (7, 8, 9) both of        them configured for being insertable inside a core (110) of a        paper roll (100) so as to engage to each other in releasable        manner;    -   Said adapter element (11) comprising an external annular wall        (12) suitable for being inserted into the core (110) of the        paper roll with a predetermined degree of mechanical        interference while said support shaft is contextually configured        for being inserted into the core of the roll without mechanical        interference, said adapter element (11) comprising an axial        channel (14 c) delimited by an annular wall (14, 14′) arranged        internally to the external annular wall (12) and comprising        first engaging elements (15 a) engaging in releasable manner to        second engaging elements (15 b) belonging to said support shaft        (7, 8, 9) so that, in use, an portion of the end (7 s) of said        support shaft (7, 8, 9) can be engaged in said axial channel (14        c) of the adapter element (11), said first engaging elements (15        a) being configured so as to be engaged to said second engaging        elements (15 b) so that said actuator element (11) is rotatable        in idle manner around said support shaft (7, 8, 9).

Advantageously, it can be further comprised a rotatable element (4)configured for being connected in rotatable manner to the dispenser sothat said rotatable element (4) is rotatable in idle manner around anaxis of rotation orthogonal to it, and comprising connection elements(50, 51) for connecting in fixed manner said support shaft (7, 8, 9) tosaid rotatable element.

Advantageously, said adapter element (11) can have an excess (13′) whichextends radially from the external annular surface (12) so as to form anannular abutment which forms an end stroke for the insertion of theadapter element within the core of the roll and with said first engagingelements (15 a) arranged on the opposite part to said annular abutment.

Moreover, here it is also described a dispenser for paper rollscomprising:

-   -   A container body (2);    -   A rotatable element (4) rotatably mounted in idle manner with        respect to said container body (2), preferably the rotation axis        (5) of said rotatable element (4) being orthogonal to said        container body (2);    -   At least a support shaft (7, 8, 9) fixed to said rotatable        element (4) and orthogonally protruding from it, said support        shaft (7, 8, 9) being suitable for inserting itself into the        channel delimited by the core of a roll so that said roll is        rotatable with respect to said support shaft (7, 8, 9).    -   According to the invention, said support shaft (7, 8, 9)        comprises second engaging elements (15 b) configured for        engaging in releasable manner the first engaging elements (15 a)        of said adapter element (11) described above, so that in use the        paper roll can be axially engaged to said support shaft (7, 8,        9) in removable manner.

Advantageously, said rotatable element (4) can comprise three supportshafts (7, 8, 9) arranged so that said rotatable element (4) isrotatable towards a direction of rotation due to the force of gravitywhen at least two of said support shafts are loaded with the respectivepaper rolls.

Advantageously, it can be provided an abutment surface (4B) arranged ata distance from the longitudinal axis of the support shaft (7, 8, 9)substantially equal or greater than the diameter of the cardboard coreof the roll intended in use for said support shaft (7, 8, 9).

Advantageously, said second engaging elements (15 b) can be configuredfor engaging the said first engaging elements (15 a) of said adapterelement (11) so as to enable a rotation in idle manner od the adapterelement with respect to said support shaft (7, 8, 9).

BRIEF DESCRIPTION OF THE DRAWINGS

Additional features and advantages of the present adapter element andrelative dispenser according to the invention will become apparent fromthe following description of preferred embodiments thereof, given onlyby way of non-limiting example, with reference to the attached drawings,wherein:

Both FIG. 1 and FIG. 2 depict a perspective view of the dispenser and inparticular FIG. 1 depicts a dispenser with three mounted rolls and FIG.2 depicts the dispenser without rolls so as to highlight the threesupport shafts of the paper rolls;

FIG. 3 is a section view of the roll mounted on a support shaft of thedispenser in order to highlight better the axis of rotation for the rolland the adapter element applied to the paper roll;

FIGS. 4 and 5 depict an axonometric view of the single axis of rotation(support shaft) and the adapter;

FIGS. from 6 to 9 depict a succession of phases of use on the presentdispenser,

Lastly, FIG. 10 depicts an example where the dispenser comprises onlyone support shaft.

DESCRIPTION OF SOME PREFERRED EMBODIMENTS

According to the invention, FIG. 1 depicts a dispenser according to theinvention with three rolls rotatably arranged each one on a supportshaft.

Therefore, FIG. 1 depicts the container body 2 for containing paperrolls.

Therefore, the container body forms as a whole the case of the dispenserand it can readily be arranged on the wall by means of fastening systemssuch as common screws.

For this reason, the container body 2, as depicted in FIG. 1, can befitted with many through holes in different positions, so as to enablethe user to fix the case in the most suitable position on the selectedwall.

Having said that, the container body shapes a lower opening 3 from whichthe paper strip of the roll in use protrudes, as depicted in FIG. 1.

Advantageously, this opening 3 can be fitted along the perimeter or apart thereof with a serrated surface which facilitates the tearing ofthe strip to the length chosen by the user.

The container body 2 of FIG. 1 and FIG. 2 is only partially depicted forsimplicity, to highlight the internal components. The remaining part ofthe covering which can be applied to it in a removable manner andpossibly fixable with anti-tampering systems such as a padlock, a lockor the like is therefore not highlighted. Obviously, it is included inthe present description.

FIG. 2 shows an axonometric view of the dispenser but without the rollsin use, so as to better highlight the additional structural elements.

In particular, a rotatable element 4 is provided, for example in theform of a disc or rotatable plate 4, which is rotatably mounted, in anidle manner, to the container body 2, by means of a fulcrum 5.

In particular, the rotatable plate 4 connects to the part of thecontainer body (or case) intended for the connection to the wall.

The fulcrum of rotation 5 can for example be a screw pin 5 which isinserted into a central channel of the plate, with the channel preciselyobtained in the center of the plate.

Therefore, the fulcrum 5 represents an axis of rotation which isorthogonal to the plane of the surface of the container body to whichsaid rotatable element 4 is connected.

The plate 4, as depicted in FIG. 2, is preferably fitted with threesupport shafts (7, 8, 9).

They are preferably arranged with an angular spacing equal to oneanother, that is 120 angular degrees.

Moreover, these support shafts are preferably fixed to the rotatableelement (4) so as not to have a relative rotation with respect to it.

They extend from the rotatable element in a direction orthogonal to theplane of the rotatable element.

The section of FIG. 3 shows, for example, in a very clear manner, thepossible fixing of a support shaft (7, 8, 9) to the rotatable element 4,for example through a conventional screw 50. Furthermore, a circular rim51 can protrude from the wall of the rotatable element 4 so as to form apilot path for the correct coupling, at the right point, of the supportshaft with the plate 4, thus ensuring that the shaft is in axis with thehole for the screw 50. For this purpose, in fact, the support shaft ispreferably fitted with an annular cavity adapted to receive saidcircular rim 51.

FIG. 3 shows with the number 100 the roll, provided with a cardboardcore 110 and which is applied to this support shaft (7, 8, 9).

FIG. 4, for greater clarity, depicts this support shaft in anaxonometric and lateral view.

Going further with the structural description of the invention andalways with reference to FIG. 3 and FIG. 5, an adapter element 11 isthen provided.

This adapter element is generally cylindrical-shaped and therefore hasan outer, generally cylindrical, annular surface 12 which is connectedto a horizontal connection (that is more or less orthogonally withrespect to the annular surface 12). This connection 13 extends radiallybeyond the cylindrical wall 12 by a predetermined quantity thus formingan excess 13′, more or less perpendicular to the wall 12 as well, thusforming an abutment for the roll (see FIG. 3 for this purpose).

This excess 13′, as depicted in FIG. 5, can be discontinuous in sectionsbut a continuous excess can be provided.

The external annular wall 12 ends, on the opposite side to the radialconnection 13, with a pilot path in the form of, for example, a slightbevel (12 s) which facilitates the insertion of the annular elementwithin the core of the paper roll.

As mentioned, the connection 13 connects the outer annular wall 12 to aninternal conical wall 14 which ends with a more or less rectilinearchannel 14′ so that, on the whole, the shape of the conical wall 14 withthe rectilinear channel 14 is similar to a funnel.

As inferable from FIG. 3, the end part of the channel 14′ provides atooth 15 a (for example a series of teeth 15 a or a single continuoustooth that extends along the circumference of the channel 14′) which issuitable for engaging itself snap-like against a relative tooth 15 bobtained at the end (7 s) of the shaft and clearly visible also in FIG.4.

Still with reference to FIG. 3, and in particular with reference to FIG.4, the axis 7 can have the front part thereof (the one where the tooth15 b is provided) divided into two symmetrical halves (7A, 7B) through acentral cut. This causes the walls (7A, 7B) to be slightly flexible anddeformable, especially if they are made of materials such as plastic, sothat they can get close to each other and return elastically to theinitial rest condition. In the same way, also the wall 14′ delimitingthe cylindrical channel for inserting the end (7 s) of axis 7 isdeformable (that is it can elastically stretch) thus greatlyfacilitating the snap coupling. In fact, it is sufficient to press theadapter element against the end (7 s) of the support shaft 7 so that itpenetrates the channel 14′ passing over the tooth 15 a and engaging thetooth 15 b against the tooth 15 a. In this operation, by means of theaforementioned flexibility of the walls, the channel 14′ slightly widenswhile, at the same time, the walls (7A, 7B) approach each other andthen, having passed over the teeth, return to the initial restcondition.

In FIG. 3 can be noticed the axis (X) that is the longitudinal axis ofthe adapter element 11 and of the support shaft after the couplingbetween the parts.

The adapter element, still as depicted in FIG. 5, can have on itscylindrical wall 12 a series of wedges 16 that facilitates the couplingwith the correct mechanical interference with respect to the cylindricalhousing of the cardboard core.

In fact, considering also the stretchiness of the core itself, theinclusion of these wedges 16 means that, within a certain range of corediameters, the coupling between the core and the adapter element has agreat mechanical interference.

In addition to this, or independently, the outer annular surface 12 canbe provided with a swelling (that is a certain concave radius ofcurvature) which facilitates the optimization of the interference incoupling with the cardboard core of the roll.

FIGS. 6 to 9 show a sequence of operation.

In particular, the three rolls in use mounted on the dispenser shaftsare indicated with the name (A, B, C). In fact, FIG. 6 depicts theadapter elements 11 which bind the rolls between the rotatable plate 4and the abutment surface 13 of the adapter, fastening the roll on theaxis and thus preventing the axial extraction thereof but enabling theclear rotation thereof around the shaft support.

The case forms a contact surface 4B on which the roll is kept in contactduring unwinding. As soon as the roll in use decreases in diameter, theresultant force of gravity of the rolls (mg is the product of the massby the acceleration of gravity) is such as to cause the plate 4 torotate in an anti-clockwise direction, thus pushing the roll in useagainst this abutment 4B.

The sequence is clearly visible in the succession of FIGS. 6 to 8 whereFIG. 8 depicts, the condition of finished roll.

The diameter of the core is such as to pass over the abutment 4B andtherefore, due to the force of gravity, the system continues therotation bringing the roll B instead of the roll A.

As soon as the roll B has run out, the rotation which transfers the rollC to the place of the roll B occurs, as described above.

The adapter element is preferably an accessory separate from thedispenser and it is previously applied to the rolls before they areapplied to the shafts (7, 8, 9) of the adapter.

In this way, by providing a supply of several rolls already fitted withthis adapter, loading the dispenser is very fast and simple.

In fact, it is sufficient to insert the core of the roll on the shaftuntil the teeth 15 a snap and therefore couple snap-like against theteeth 15 b of the support shaft.

This coupling prevents the axial extraction of the roll withoutpreventing the clear idle rotation of the roll on the support shaft.

The extraction is even simpler as it is sufficient to remove theconsumed roll by removing the core with the adapter thereof.

The teeth at the end of the support shaft have a curved profile thatforms a pilot path that facilitates the coupling and even the separationwhen a traction is applied for removal.

A pilot path is also preferably shaped in the teeth 15 a of the adapterelement with a sloping side that facilitates the coupling.

By means of the fact that the end of the adapter element islongitudinally notched, thus forming the two parts (7A, 7B), thisfacilitates not only the coupling but also the release since, whileslipping off, these two parts (7A, 7B) approach each other facilitatingthe extraction (moreover further facilitated by the curved profile oftooth 15 b).

The use of the adapter element, as inferable from the attached figures,not only enables a fast and safe rotatable coupling of the paper roll tothe support shaft but, moreover, it correctly shapes the core of theroll even in the event where this is deformed.

Being understood the above description, it is obvious that the presentinvention can be realized with any number of support shafts, for exampletwo support shafts and preferably three support shafts (preferredembodiment).

For example, FIG. 10 depicts the embodiment of a dispenser with adapterand a single support shaft.

The invention claimed is:
 1. An adapter element (11) configured forbeing insertable inside a core (110) of a paper roll (100) to be appliedto a support shaft (7, 8, 9) of a dispenser (10) for paper rolls, saidadapter element comprising: an external annular wall (12) configured forbeing inserted into the core (110) of the paper roll with apredetermined degree of mechanical interference; and an axial channel(14 c) delimited by an annular wall (14, 14′) arranged internally to theexternal annular wall (12) and comprising first engaging elements (15 a)configured for being engaged in releasable manner to second engagingelements (15 b) belonging to said support shaft (7, 8, 9) of thedispenser so that, in use, an end portion (7 s) of said support shaft(7, 8, 9) can be engaged in said axial channel (14 c) of the adapterelement (11), wherein said first engaging elements (15 a) are configuredto be engaged to said second engaging elements (15 b), so that saidadapter element (11) is rotatable in idle manner around said supportshaft (7, 8, 9) to which said adapter element (11) is engaged in use. 2.The adapter element (11), according to claim 1, wherein said adapterelement (11) has an excess (13′) which extends radially from theexternal annular wall (12) so as to form an annular abutment, whichforms an end stroke for an insertion of the adapter element within thecore of the paper roll with said first engaging elements (15 a) arrangedon an opposite part to said annular abutment.
 3. The adapter element(11), according to claim 1, wherein said external annular wall (12) isprovided with one or more wedges (16).
 4. The adapter element (11),according to claim 1, wherein said external annular wall (12) isconfigured so as to have a predetermined degree of flexibility.
 5. Theadapter element (11), according to claim 1, wherein said externalannular wall (12) is of cylindrical shape and is configured for forminga pilot path at an end thereof.
 6. The adapter element (11), accordingto claim 1, wherein said first engaging elements (15 a) are shaped as atooth (15 a) and said annular wall (14, 14′), on which said tooth isarranged, is configured to be elastically deformable so that, in use,when the support shaft (7, 8, 9) is inserted into the axial channeldelimited by said annular wall (14, 14′), said annular wall iselastically deformed enabling said tooth to pass over a second tooth (15b) belonging to the end portion of the support shaft by locking itselfagainst said second tooth once passed over said second tooth.
 7. Anassembly for constraining a paper roll fitted with a core to adispenser, said assembly comprising: an adapter element (11); and asupport shaft (7, 8, 9), said adapter element and said support shaftbeing configured for being insertable inside said core (110) of saidpaper roll (100) so as to engage to each other in a releasable manner;said adapter element (11) comprising an external annular wall (12)configured for being inserted into the core (110) of the paper roll witha predetermined degree of mechanical interference, said support shaftbeing configured for being inserted into the core of the paper roll, sothat the paper roll unobstructedly rotates around said support shaft,said adapter element (11) further comprising an axial channel (14 c)delimited by an annular wall (14, 14′) arranged internally to theexternal annular wall (12) and comprising first engaging elements (15 a)engaging in a releasable manner to second engaging elements (15 b)belonging to said support shaft (7, 8, 9) so that, in use, a portion ofan end (7 s) of said support shaft (7, 8, 9) can be engaged in saidaxial channel (14 c) of the adapter element (11), said first engagingelements (15 a) being configured so as to be constrained to said secondengaging elements (15 b) so that said adapter element (11) is rotatablein idle manner around said support shaft (7, 8, 9).
 8. The assembly,according to claim 7, wherein said adapter element (11) has an excess(13′) which extends radially from the external annular surface (12) toform an annular abutment, which forms an end stroke for an insertion ofthe adapter element within the core of the paper roll and with saidfirst engaging elements (15 a) arranged on an opposite side to saidannular abutment.
 9. The assembly, according to claim 7, furthercomprising a rotatable element (4) configured for being connected inrotatable manner to the dispenser so that said rotatable element (4) isrotatable in idle manner around an axis of rotation orthogonal thereto,wherein connection elements (50, 51), for connecting in fixed mannersaid support shaft (7, 8, 9) to said rotatable element, are provided.10. The assembly, according to claim 9, wherein said connection elementscomprise an axial channel obtained in the support shaft (7, 8, 9) and ahole arranged in the rotatable element within which a fastening screw isapplied and constrained in the axial channel of the support shaft forconnecting in fixed manner the support shaft to said rotatable element.11. The assembly, according to claim 10, wherein said rotatable elementcomprises a rim (51) which protrudes orthogonally from the rotatableelement (4) and is configured for inserting in a receiving annularcavity of the support shaft (7, 8, 9) so as to form a centering systemwhich ensures coaxiality between the axial channel of the support shaftand the hole of the rotatable element for fastening the fastening screw.12. The assembly, according to claim 7, wherein said external annularsurface (12) is fitted with one or more wedges (16).
 13. The assembly,according to claim 7, wherein said external annular surface (12) isconfigured to have a predetermined degree of flexibility.
 14. Theassembly, according to claim 7, wherein a shape of said external annularsurface (12) is cylindrical and is configured for forming a pilot pathat an end thereof.
 15. The assembly, according to claim 7, wherein saidfirst engaging elements (15 a) are in form of a tooth (15 a) and saidannular wall (14, 14′), on which said tooth is arranged, is configuredso as to be elastically deformable so that, in use, when the supportshaft (7, 8, 9) is inserted in the channel delimited by said annularwall (14, 14′), said annular wall is elastically deformed, thus enablingsaid tooth to pass over a second tooth (15 b) belonging to an end of theshaft, thus blocking itself in contrast against said second tooth oncesaid second tooth has been passed over.
 16. The assembly, according toclaim 7, wherein said support shaft (7, 8, 9) has an anterior partdivided into two symmetrical halves (7A, 7B) through a longitudinalnotch, which runs along a part of a longitudinal length of the supportshaft so as to generate two flexible walls (7A, 7B) spaced from eachother through said notch, each of the two flexible walls being providedwith said second engaging elements.
 17. The assembly, according to claim9, wherein said rotatable element is configured as a plate.
 18. Theassembly, according to claim 9, wherein said rotatable element comprisesat least two support shafts.
 19. A dispenser (10) for paper rollscomprising: a container body (2); and an assembly according to claim 7.20. The dispenser (10), according to claim 19, wherein the rotatableelement (4) of the assembly comprises three support shafts (7, 8, 9)arranged so that said rotatable element (4) is rotatable towards adirection of rotation due to the force of gravity when at least one ofsaid support shafts are loaded with a respective paper roll.
 21. Thedispenser (10), according to claim 19, further comprising an abutmentsurface (4B) arranged at a distance from a longitudinal axis of thesupport shaft (7, 8, 9) equal or greater than a diameter of the core ofthe paper roll to be supported by said support shaft (7, 8, 9).